WO2002006008A1

WO2002006008A1 - Contact-discharge truing/dressing method and device therefor

Info

Publication number: WO2002006008A1
Application number: PCT/JP2001/006040
Authority: WO
Inventors: Masahiro Mizuno
Original assignee: Japan Science And Technology Corporation
Priority date: 2000-07-14
Filing date: 2001-07-12
Publication date: 2002-01-24
Also published as: JP2002086356A; KR20030047990A; US6939457B2; DE60122901T2; CN1192857C; EP1306164A4; US20040040864A1; CN1441714A; EP1306164A1; JP4010392B2; EP1306164B1; DE60122901D1; KR100514205B1

Abstract

A contact-discharge truing/dressing method and a device therefor, capable of very simply conducting truing/dressing of a superabrasive grindstone, especially a superabrasive grindstone having metal binder. The contact-discharge truing/dressing method comprises the steps of bringing a rotated conductive grindstone (101) into contact with a pair of electrodes to which a dc voltage or pulse voltage is applied, and subjecting the conductive grindstone (101) to an intermittent truing/dressing by contact discharge produced when opening/closing a circuit consisting of a positive electrode, electrode chips, a grindstone binder, electrode chips, and a negative electrode, parts of the side surfaces of dual-ring rotary electrodes insulated by an insulation layer (203) being used as a pair of electrodes.

Description

TECHNICAL FIELD Contact discharge truing and dressing method and apparatus therefor

The present invention relates to a contact discharge tooling 'dressing method and apparatus using a double ring-shaped rotating electrode. Background art

Super-abrasive grinding wheels have less wear than conventional grinding wheels and are suitable for high-precision shape creation. However, on the other hand, tooling and dressing is difficult, so it is not widely used.

Among super-abrasive grinding wheels, methods such as discharge tooling, dressing, and electrolytic dressing are applied to conductive grinding wheels that use metal or the like as a binder (Journal of the Japan Society of Abrasive Technology Vo 1.39, No. 5 1 9 9 5, SEP, P. 21 1, P. 22, P. 2

5, see p. 26), but all of the conventional methods are performed in liquid, and are not suitable for dry grinding machines commonly used in the die manufacturing industry. Also, in the above method, it was necessary to supply power to the grindstone spindle using a brush, which was not simple.

On the other hand, there is a contact discharge tooling 'dressing method in which a voltage is applied to a pair of electrodes sandwiching an insulating grindstone, and this is ground with a conductive grindstone. Journal of the Japan Society of Abrasive Technology Vo 1.39, No. 5 1995, SEP, p. 24). This method is simple because there is no need to use a brush to supply power to the grindstone spindle.

However, in this conventional contact discharge tooling and dressing method, a stable contact discharge phenomenon cannot be obtained because the electrode is ground with a grinding stone while the depth of cut of the grinding stone with respect to the electrode and the electrode feed speed are kept constant. However, in some cases, there was a problem that the circumference of the working surface of the grinding wheel was periodically uneven (see Proceedings of the 1900 Spring Meeting of the Japan Society for Precision Engineering, pp. 933-934). In addition, the electrodes were consumed mainly due to mechanical shaving of the electrodes. Furthermore, this contact discharge tooling 'dressing method is not It could not be applied to conductive grinding wheels.

In addition, there are several types of “grinding” dressing methods that remove abrasive grains by mechanically shaving off the binder (usually a binder other than metal) using a rotating conventional grindstone. Journals V o 1.39, No. 5 1995, SEP, pp. 8-11).

When both methods are applied dry, a large amount of abrasive particles are scattered, which has been a problem because it has a negative effect on the life of machine tools and the human body. Also, since it is tooling 'dressing by mechanical force, there was a problem that the cutting edge was chipped when trying to create a V-shaped sharp cutting edge shape.

Also, in any of the above-mentioned tooling and dressing methods, no measure has been taken for truing and dressing while monitoring the magnitude of the roundness of the grindstone. For this reason, it was not possible to automatically and continuously shift the tooling / dressing conditions from rough to finish. Also, it was not possible to judge at which point the “dressing” dressing should be finished while performing the “dressing” dressing.

In addition, none of the above-mentioned methods for dressing and dressing while monitoring the amount of reduction in the radius of the grinding wheel due to the tooling has been adopted. For this reason, it was not possible to perform machining while correcting the tool path (tool path) in in-process tooling 'dressing. Disclosure of the invention

As described above, any conventional tooling and dressing methods have various problems.

In view of the above-mentioned circumstances, the present invention provides a contact discharge truing and dressing method capable of extremely easily performing the grinding and dressing of a superabrasive stone, particularly a superabrasive stone having a metal binder, and a method thereof. It is intended to provide a device. The present invention, in order to achieve the above object,

[1] Conduction rotated with respect to a pair of electrodes to which DC voltage or pulse voltage is applied The contact discharge that occurs when a circuit consisting of a positive electrode, one chip, one chip, one wheel binder, one chip, and one negative electrode is opened and closed intermittently. A contact discharge truing and dressing method in which the conductive grinding target's dressing grindstone is truing and dressing, wherein a part of the side surface of the double ring type rotary electrode insulated with an insulator is used as a pair of electrodes. It is characterized by being used.

[2] A rotating non-conductive truing / dressing grindstone is brought into contact with a pair of electrodes to which a DC voltage or a pulse voltage is applied. A contact discharge tooling and dressing method in which the non-conductive tooling and dressing grindstone is tooled and dressed by contact discharge generated when a circuit is opened and closed. a part of the side surface of the double ring-shaped rotary electrode insulated by an insulator of m or less is used as a pair of electrodes.

[3] A rotating conductive tooling / dressing grindstone is brought into contact with a pair of electrodes to which a DC voltage or a pulse voltage is applied, and the positive electrode—electrode chips—grinding stone binder—electrode The contact discharge generated when opening and closing the circuit composed of the chip and the negative electrode causes the conductive tooling 'dressing grindstone to be dressed and dressed by a contact discharge tooling and dressing device. It is characterized by comprising a double ring-shaped rotary electrode insulated by an insulator, and a pair of electrodes composed of a part of the side surface of the double ring-shaped rotary electrode.

[4] A rotating non-conductive tooling 'dressing wheel is brought into contact with a pair of electrodes to which a DC voltage or pulse voltage is applied, and intermittently from the positive electrode-electrode chip-negative electrode A contact discharge tooling and dressing apparatus in which the non-conductive tooling / dressing grindstone is dressed and dressed by a contact discharge generated when the configured circuit is opened and closed. It is characterized by comprising a double ring-shaped rotary electrode insulated by an insulator of not more than m and a pair of electrodes consisting of a part of the side surface of the double ring-shaped rotary electrode.

[5] The contact discharge tooling and dressing device according to the above [3] or [4], further comprising a drive mechanism for rotating the double ring-shaped rotary electrode in a rotation axis direction. And features.

(6) The contact discharge tooling and dressing device according to the above (3), (4) or (5), characterized in that the contact discharge tooling and dressing device has a structure capable of supplying power to a double ring type rotating electrode having a different diameter. I do.

[7] The contact discharge tooling 'dressing method according to [1] or [2], wherein the contact discharge is performed in a liquid, spray, or air environment.

[8] In the contact discharge tooling and dressing method according to the above [1] or [2], in order to remove the initial rotational runout of the side surface of the double ring-shaped rotating electrode, the contact is applied without supplying power between the electrodes. After grinding the electrode side surface with a truing / dressing grindstone, a voltage is applied between the electrodes to start truing / dressing.

(9) In the contact discharge tooling / dressing method, the apparatus according to (3), (4) or (5) is used, and the rotation axis of the electrode and the rotation axis of the tooling / dressing grindstone are used. By feeding the electrode in the direction of the electrode rotation axis with a predetermined angle therebetween, a predetermined grinding wheel edge shape is obtained.

[10] In the contact discharge tooling 'dressing method, the device according to [3], [4] or [5] is used, and the driving device for the double ring-shaped rotary electrode is provided with a cross movement mechanism and a rotation mechanism. It is installed on a numerically controlled moving table equipped to perform high-precision integrated tooling and dressing.

[11] In the contact discharge tooling 'dressing method, the device described in [3], [4] or [5] is used, and the power supply circuit side of the device is contacted in series with the electrode pair. insert the discharge current limiting resistor and a current detector, so that the contact-discharge current is the maximum power consumption in between the electrodes when a peak value I _P, when the ie, a power supply voltage and E I = It is characterized in that the feed rate of the double ring-shaped rotary electrode in the direction of the rotation axis is numerically controlled so that E / (2R).

[1 2] [1 1] Te contact discharge vine one Brewing dressing method odor wherein the current output from the detector mean I _m and the peak value I _P to be vine one Brewing Doretsushingu grindstone revolution or more At the cycle of, and based on the value of I _m ZI, it is possible to estimate the roundness of the dressing whetstone. Is performed.

(13) In the contact discharge tooling 'dressing method according to (1 2), the contact discharge power consumption is controlled by numerical control or automatic control based on the roundness of the estimated tooling' dressing grindstone. E ■ It features high-precision drawing and dressing by automatically adjusting the size of Ip / 2.

[14] In the contact discharge tooling 'dressing method according to the above [1 2], when the estimated roundness of the dressing' dressing stone falls below a predetermined size, the tool is removed. Inching and dressing are automatically terminated

[15] In the contact discharge tooling 'dressing method according to [11], the type of the supply voltage to the double ring type rotating electrode is set to DC voltage so that the control is performed more stably. It is characterized by automatic switching between pulse voltages.

[16] In the contact discharge tooling and dressing device according to the above [3], [4] or [5], a displacement sensor for measuring the position of the electrode side surface is provided on the electrode side surface, and the tooling is performed. It is characterized in that tooling and dressing are performed while measuring the amount.

(17) The contact discharge tooling / dressing device according to the above (3), (4) or (5), further comprising a displacement sensor for measuring a position of the electrode side surface on the electrode side surface. I do.

[18] The contact discharge tooling and dressing method described in [16] above is applied to in-process tooling 'dressing, and the laser path is determined based on the amount of the nozzle. It is characterized in that it is performed while correcting.

[1 9] The contact discharge tooling and dressing method according to [1] or [2], wherein a stone is arranged inside the double ring-shaped rotating electrode, and One feature is to remove deposits of electrode material on the dressing whetstone.

[20] In the contact discharge tooling 'dressing method according to the above [1] or [2], a grindstone is arranged outside the double ring-shaped rotating electrode, and the above-mentioned coated dressing and dressing is performed at every discharge. The feature is to remove deposits of the electrode material on the grindstone. [21] The contact discharge tooling and dressing apparatus according to the above [3] or [4], characterized in that a grindstone is arranged inside the double ring-shaped rotating electrode.

[22] The contact discharge tooling and dressing device according to the above [3] or [4], wherein a grindstone is arranged outside the double ring-shaped rotary electrode. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of a contact discharge tooling and dressing apparatus showing an embodiment of the present invention.

FIG. 2 is a block diagram of a control device of the contact discharge tooling and dressing device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of a contact discharge tooling and dressing method showing an embodiment of the present invention.

FIG. 4 is an enlarged view of part A of FIG. 3 and illustrates the tooling and dressing mechanism (part 1).

FIG. 5 is an enlarged view of part A of FIG. 3 and illustrates the tooling and dressing mechanism (part 2).

FIG. 6 is a main part configuration diagram of a contact discharge tooling dressing device having an electrode feed drive mechanism according to an embodiment of the present invention.

FIG. 7 is a configuration diagram of a power supply mechanism of the contact discharge tooling and dressing apparatus according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing an example in which the diameter of the double-ring rotary electrode of the contact discharge tooling and dressing device shown in FIG. 7 is changed.

FIG. 9 is an explanatory diagram of various contact discharge truing and dressing methods of the present invention.

FIG. 10 is a view showing a method for removing rotational vibration on the side surface of an electrode according to an embodiment of the present invention.

FIG. 11 shows an embodiment of the present invention. A contact discharge tool for obtaining a V-shaped grinding wheel tip shape. -It is explanatory drawing of an ining 'dressing method.

FIG. 12 shows a configuration of a contact discharge truing / dressing apparatus in which a driving device for a double ring-shaped rotary electrode according to an embodiment of the present invention is installed on a numerically controlled moving table provided with a cross moving mechanism and a rotating mechanism. FIG.

FIG. 13 is an explanatory diagram of a method for numerically controlling the feed speed of the double ring-shaped rotary electrode in the direction of the rotation axis according to the embodiment of the present invention.

FIG. 14 is an explanatory diagram of a method for estimating the roundness of a grindstone according to an embodiment of the present invention.

FIG. 15 shows a method of automatically adjusting the magnitude of the contact discharge power consumption E · Ip / 2 by numerical control or automatic control based on the estimated value of the roundness of a grinding wheel according to an embodiment of the present invention. FIG.

FIG. 16 is a diagram illustrating a method of automatically terminating contact discharge tooling and dressing when the estimated value of the roundness of a grindstone reaches a predetermined value according to the embodiment of the present invention. FIG. 17 shows a method of automatically switching the type of the supply voltage to the double-ring type rotating electrode between the DC voltage and the pulse voltage so that the control according to the embodiment of the present invention is performed more stably. FIG.

FIG. 18 is an explanatory diagram of a method for performing contact discharge pulling and dressing while measuring the amount of luing according to an embodiment of the present invention.

FIG. 19 is a view showing a modification of the method for performing contact discharge tooling and dressing shown in FIG.

FIG. 20 is an explanatory diagram of a contact discharge truing and dressing method applied to in-process tooling and dressing showing an embodiment of the present invention and correcting a tool path based on the amount of tooling. .

FIG. 21 is a view showing a twin-dressing and dressing apparatus having a double ring-shaped rotating electrode in which a conventional grindstone (non-conductive grindstone) according to an embodiment of the present invention is disposed.

FIG. 22 is a view showing a truing dressing apparatus having a double ring-shaped rotating electrode having a conventional grindstone (a non-conductive grindstone) arranged outside, showing an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of a contact discharge truing and dressing apparatus showing an embodiment of the present invention. Here, noted _c shows an example of applying the contact discharge vine one Ingu ■ Doretsushingu method of the double-ring-shaped rotating electrode type on the cutting edge crane one queuing profile grinding ffi stones, in the first illustration of rolled stone for profile grinding Although the rotating shaft and the rotating shaft of the double ring-shaped rotating electrode are shown perpendicular to each other, this is for the sake of simplicity in the explanation, and the cutting edge of the grinding wheel for profile grinding is actually 30. 30 between these axes to form a V-shape. Gave the angle.

In this figure, 1 is a grinding stone for profile grinding (grinding and dressing whetstone), 2 is a base, 3 is a front cover, 4 is a ◦ ring, 5 is a 〇 ring presser lid, and 6 is a rear cover. , 7 is a connector, 8 is a cover, 9 is a handle, 10 is a front limiter, 11 is a rear limiter, 12 is a motor bracket, 13 is a stepping motor, 14 is a power coupling, and 15 is a ball. Screw, 16 is a ball screw support unit, 17 is a nut, 18 is a nut bracket, 19 is a spindle moving table, 20 is a linear guide rail, 21 is a linear guide slider, and 22 is a motor bracket. , 23 is a DC motor, 24 is a coupling, 25 is a spindle, 26 is a spindle support unit, 27 is a spindle auxiliary servo unit, 28 is a mechanical lock, 29 is an electrode holder, 30 Is the insulating layer, 31 is the outer ring of the double ring type rotating electrode 3 2 double ring-shaped rotating electrode insulating layer, 3 3 double ring-shaped rotating electrode inner ring, 3 4, 3 5 power supply brush, 3-6 power supply brush bracket 3 7 is a displacement sensor.

First, the structure of a double ring type rotary electrode type contact discharge tooling / dressing apparatus will be described with reference to FIG.

A ball screw support unit 16 is fixed to the base 2, and thereby a ball screw 15 having a pitch of 1 mm is supported. One end of the ball screw 15 is connected to a rotating shaft of a stepping motor 13 via a coupling 14 and is driven to rotate at a step angle of 0.1 °. The stepping motor 13 is fixed to the base 2 by a motor bracket 12. The nut 17 is engaged with the ball screw 15 and is sent in the direction of the rotation axis by the rotation of the stepping motor 13. The nut bracket 18 is fixed to the nut 17 so that when the switch of the front limiter 10 or the rear limiter 11 is pressed, the stepping motor stops.

Also, two linear guide rails 20 extending in the electrode rotation axis direction are fixed to the base 2 in parallel. Each linear guide rail 20 is equipped with two linear guide sliders 21. The spindle moving table 19 is fixed to the linear guide slider 21 and the nut bracket 18 and is driven in the direction of the electrode rotation axis by the driving motor 13.

The main shaft 25 is supported by a main shaft subunit 26 fixed on a moving table and a main shaft auxiliary support unit 27, and one end thereof is connected to a DC motor 2 for rotating and driving it via a coupling 24. Connected to 3. The DC motor 23 is fixed on the spindle moving table 19 using a motor bracket 22. Carbon (or copper) was used as the electrode material for the outer ring 31 and the inner ring 33 of the double ring-shaped rotating electrode, and epoxy resin was used for the double ring-shaped rotating electrode insulating layer 32 that insulates both. Here, the thickness of the insulating layer between the electrodes was about 500 μm. The double-ring type rotating electrode and the electrode holder 29 are bonded by an insulating layer 30 made of a thermoplastic resin having high insulating properties. Double ring type rotary electrode outer ring 3 1, Double ring type rotary electrode inner ring 3 3, Double ring type rotary electrode insulating layer 32 and electrode holder 29 Double ring type rotary electrode is mechanical lock 2 It is fixed to the spindle 25 by 8. The outer ring 31 and the inner ring 33 of the double ring type rotating electrode are in contact with power supply brushes 34, 35 which are pressed by springs, and power is supplied by this. These power supply brushes 34, 35 are supported by a power supply brush bracket 36, which is fixed on a spindle moving table 19, and is made of baselite. This embodiment does not employ the power supply system according to the sixth aspect of the present invention.

The displacement sensor 37 is installed on the table or the base 2 of the grinding machine, and monitors the position of the electrode side surface to monitor the position of the cutting edge of the profile grinding wheel.

FIG. 2 is a diagram showing the control of a contact discharge tooling and dressing device according to an embodiment of the present invention. It is a block diagram of a control apparatus.

In this figure, 38 is a discharge current limiting resistor, 39 is a Hall current detector, 40 is a numerical processing device, 41 is a digital input device, 42 is a digital output device, 43 is an AD converter, 4 is a DA converter, 45 is a peak detection circuit, 46 is a low-pass filter, 47 is a VF converter, 48 is a switching circuit, 49 is a Y-type relay, 50 is a power amplifier circuit, and 5 1 Is a stepping motor dryer, 52 and 53 are analog switches, 54 is a DC motor driver, 55 is a manual operation device, and 56 is an amplifier. Hereinafter, the control device will be described with reference to FIG.

Digital I / O devices 41, 42. A / D converter 43 and a numerical processing device 40 having a D / A converter 44 are used for control.

A power amplifying circuit 50 using a power operational amplifier is used as a power supply of the discharging circuit, and the output voltage can be set by a finger from the numerical processing unit 40. As a result, it is possible to continuously change the truing conditions from the rough truing to the finishing truing. The output of the power amplification circuit 50 is electrically insulated from a commercial power supply and a ground for safety.

The positive electrode of the output of the power amplification circuit 50 is directly connected to the power supply brush 35. On the other hand, the negative pole of the output of the power amplification circuit 50 is connected to a Y-type relay 49 that can be switched by a command from the numerical processing unit 40, where switching between DC voltage and pulse voltage is performed. . When a pulse voltage is used, a switching circuit 48 composed of a field-effect transistor is connected, and then a DC voltage connected to the power supply brush 34 via the Hall current detector 39 and the discharge current limiting resistor 38 is applied. Do not go through the switching circuit 48. The switching frequency of the switching circuit 48 can be set by a command from the numerical processing unit 40 by using a VF converter (voltage-to-frequency converter) 47.

Also, the output from the Hall current detector 39 is divided into three paths and taken into the numerical processing unit 40. The first path is a path for directly taking in the output. The second path is a path taken after passing through the peak detection circuit 45. The peak value of the contact discharge current can be obtained from the signal voltage of the second path (corresponding to the invention according to claims 11, 12, or 13). Note that the peak detection circuit 45 is a finger from the numerical processing unit 40. It is reset at a cycle of one turn or more of the grinding wheel. Third path is one-pass filter

This is the route to take in after passing through 6. The average value _Ira of the contact discharge current can be obtained from the signal voltage of the third path (corresponding to the invention according to claim 12).

The stepping motor 13 is driven according to the output from the Hall current detector 39. Specifically, the contact discharge current has a peak value I. (Equivalent to the invention according to claim 11) so that the power consumption between the electrodes is maximized, that is, when the power supply voltage is E, _IP = E / (2R) Then, the rotation speed and rotation direction of the stepping motor 13 are numerically controlled. Also, when the front limiter 10 or the rear limiter 11 is pressed, the analog switch 52, 53 is used to cut off the input pulse to the stepping motor dryino 51. Output signals from the front limiter 10 and the rear limiter 11 are also sent to the numerical processing unit 40. In addition, the start-stop command, rotation direction switching, and rotation speed adjustment of DC 乇 23 are all performed manually by the manual operation device 55, and the alarm output signal when an abnormal force is generated in the DC motor 23 is output. Only the signal line is connected to the numerical processing unit 40, so that processing in the event of an abnormality can be performed.

Further, the output of the displacement sensor 37 is amplified by the amplifier 56, and then taken into the numerical processing unit 40, which is used for the modular ring at the cutting edge position of the grinding wheel 1 for profile grinding (see Fig. 1). Is done.

FIG. 3 is an explanatory view of a contact discharge truing dressing method according to an embodiment of the present invention, and FIGS. 4 and 5 are diagrams enlarging a portion A of FIG. 3 and explaining a tooling mechanism thereof. is there.

For example, as shown in FIG. 4, a double ring-shaped rotating electrode 201 composed of an electrode inner ring 202, an insulating layer 203, and an electrode outer ring 204 is used. Then, a DC voltage or a pulse voltage is applied between the electrode inner ring 202 and the electrode outer ring 204 to rotate. When this double ring type rotary electrode 201 is sent in the direction of the rotation axis and its side surface is brought into contact with the conductive grinding wheel 101, the electrode outer ring 204 0 2—Electrode swarf 2 2 1—Contact discharge occurs in the electrode swarf 22 0 and 22 1 of the circuit composed of the inner electrode ring 202, and the heat causes the conductive binder 1 02 melts and abrasive grains 103 fall off. In the tooling device of FIG. 4, the insulating layer 20 The thickness of 3 may be several hundred / m or more.

On the other hand, as shown in FIG.

If the thickness of the layer 12 is made several hundreds // m or less, it can be applied to the tooling of the non-conductive grindstone 110. In this case, when the side surface of the double ring type rotating electrode 201 is brought into contact with the non-conductive grindstone 110, the electrode outer ring 2 13—electrode chips 2 2 2—electrode inner ring 2 1 1 Contact discharge occurs at the electrode chips 222 in the circuit composed of the electrodes, and the heat dissolves the non-conductive binder 111, causing the abrasive grains 112 to fall off. Thus, by reducing the thickness of the insulating layer between the electrodes, it becomes possible to perform dressing and dressing of the non-conductive grindstone.

In these methods, there is no need to use a brush to supply power to the main shaft of the "ruling" dressing grindstone 100, which is simple. Also, single-ing dressing can be performed under dry conditions.

The discharge power control of the contact discharge is performed as follows. As shown in Fig. 3, a discharge current limiting resistor R and a hole current detector A are inserted in the power supply circuit side in series with the electrode pair. In this circuit, the contact discharge power reaches the maximum with respect to the power supply voltage E when the current value I becomes I = EZ (2R). If there is a run-out on the tooling surface, the current I fluctuates with the rotation cycle of the grinding wheel 100, but its maximum value _IP is EZ

If the feed speed V of the electrode in the direction of the rotation axis is controlled so as to satisfy (2R), it is possible to efficiently remove the portion with the largest runout. 105 is a DC power supply or a pulse power supply.

FIG. 6 is a main part configuration diagram of a contact discharge truing and dressing apparatus having an electrode feed mechanism according to an embodiment of the present invention.

As shown in this figure, the double ring-shaped rotary electrode 201 is configured to be fed in the direction of the rotation axis of the double ring-shaped rotary electrode 201 by an electrode feed drive mechanism 120. In FIG. 6, 100 is a grindstone, and 105 is a DC power supply or a pulse power supply. FIG. 7 is a configuration diagram of a power supply mechanism of a contact discharge tooling dressing device showing an embodiment of the present invention.

In this figure, 1 2 1 is a rotating main shaft of the double ring type rotating electrode 201, 1 2 2 is a conductor ring fixed to the rotating main shaft 1 2 1, 1 2 3 is an insulating layer, 1 2 4 is electrode Flange, 1 2 5 is a washer, 1 2 6 is an electrode fixing bolt for electrically connecting the rotating spindle 1 2 1 and the electrode inner ring 2 0, 2 is a electrode outer ring 2 4 and the electrode flange 1 2 4 The power supply springs for electrically connecting the power supply brushes, and the power supply brushes 1 28 and 1 2 9 are provided.

In this way, the power supply brush 1 2 8 One conductor ring 1 2 2—Rotating spindle 1 2 1 One electrode Fixing bolt 1 2 6 —Power is supplied to the inner electrode ring 202 via the washer 1 25 and the power supply brush 1 2 9 —Electrode flange 1 2 4 —Supplied to the outer electrode ring 204 via the power supply spring 1 2 7.

FIG. 8 is a cross-sectional view showing an example of the contact discharge truing and dressing apparatus shown in FIG. 7 in which the diameter of the double ring-shaped rotary electrode is changed.

As shown in this figure, in this embodiment, a double ring-shaped rotating electrode 201 'having a small diameter is provided.

FIG. 9 is an explanatory view of various contact discharge truing and dressing methods of the present invention. FIG. 9 (a) shows a contact discharge in a liquid, FIG. 9 (b) shows a contact discharge in a spray, and FIG. In (c), the contact discharge is performed in an air environment. The same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

That is, as shown in FIG. 9 (a), when performing contact discharge in a liquid, a liquid supply nozzle 301 is arranged at the contact discharge point, and the contact discharge is performed while supplying the liquid 302. Let it do.

As shown in Fig. 9 (b), when contact discharge is performed during spraying, a spray supply nozzle 303 is arranged at the contact discharge location, and contact discharge is performed while supplying spray 304. Is performed.

Of course, as shown in FIG. 9 (c), the contact discharge may be performed in the air without any supply.

FIG. 10 is a view showing a method of removing the rotational vibration on the side surface of the electrode according to the embodiment of the present invention.

As shown in this figure, in order to remove the initial run-out of the side surface of the double ring-shaped rotating electrode 201, the switch 107 is turned off, and power is not supplied between the inner electrode ring and the outer electrode ring. Tooling and dressing After grinding the electrode side surface with a stone 100, apply voltage between the electrode inner ring and the electrode outer ring to start the tooling and dressing. FIG. 11 is an explanatory view of a contact discharge tooling and dressing method for obtaining a V-shaped grinding wheel tip shape according to an embodiment of the present invention.

In this embodiment, the double ring type rotary electrode is provided while a predetermined angle 0 is given between the rotary spindle 400 of the double ring type rotary electrode 405 and the rotary axis 402 of the grinding wheel 401. By giving the electrode 405 a feed in the direction of the electrode rotating main shaft 406, it is possible to obtain a predetermined shape of the talc tip.

FIG. 12 shows an embodiment of the present invention, in which a drive device for a double ring-shaped rotary electrode is mounted on a numerically controlled moving table provided with a cross-moving mechanism and a rotating mechanism, and a configuration of a contact discharge tool / single dressing apparatus. FIG.

In this embodiment, the driving device of the double ring type rotary electrode 4 15 is installed on a numerically controlled moving table 4 18 provided with a cross moving mechanism and a rotating mechanism. In other words, contact discharge tooling 'dressing is performed by associating the double-ring rotating electrode 4 15 with the grinding wheel 4 10 fixed to the grinding wheel rotating shaft 4 1 1. The drive mechanism of the rotating main shaft 4 16 of the electrode 4 15, that is, the tooling / dressing device main body 4 17 is installed on the numerically controlled movement table 4 18 provided with a cross movement mechanism and a rotation mechanism. This makes it possible to perform high-precision total tooling and dressing.

FIG. 13 is a diagram illustrating a method of numerically controlling the feed speed of the double ring-shaped rotary electrode in the direction of the rotating shaft according to an embodiment of the present invention. FIG. 13 (a) is a diagram of the system configuration FIG. 13 (b) is a waveform diagram of the current by the numerical control.

In this embodiment, a contact discharge current limiting resistor R and a current detector A are inserted on the power supply circuit side of the device so as to be in series with the double ring-shaped rotating electrode 201, and the contact discharge current peaks. when taking the value I _P, as the power consumption during the double ring-shaped rotating electrode 2 0 1 is maximized, i.e., so = the EZ (2 R) when the supply voltage is E, the two The feed speed of the double ring type rotary electrode 201 in the direction of the rotary shaft 121 is controlled by the numerical controller 501.

As a result, the contact discharge state can be kept extremely stable, and periodic irregularities occurring on the grinding wheel working surface can be suppressed. In addition, the rate at which the electrode is mechanically wasted is reduced, so that electrode consumption can be reduced. This preserves the working environment in a clean environment It also leads to doing.

FIG. 14 is an explanatory diagram of a method of estimating the roundness of ffi stones showing an embodiment of the present invention. FIG. 14 (a) is a configuration diagram of the system, and FIG. 14 (b) is a diagram. It is a waveform diagram of the current by the numerical control.

In this embodiment, the average value I _m and the peak value I _P of the output from the current detector A are obtained in a cycle of one turn or more of the grinding wheel, and the roundness of the grinding wheel is estimated based on the value of I _m / I _P Then, do dressing 'dressing. In other words, providing the roundness estimation apparatus 602 of the wheel for estimating the circularity of the grindstone from the value of I _m ZI _P. Uni shown in the first FIG. 4 (b), a high roundness of the grindstone larger the value of I _m / I _P. Incidentally, 60 1 is a numerical controller peak value I _P is numerically controlled electrode feed speed such that I _P = E / (2R) of the current I.

Thus, measured at the mean value I _m and the peak value I _P grindstone one rotation or more cycles of the output from the current detector A, estimates the roundness of the grindstone on the basis of the value of I _m / I _P While performing dressing and dressing, it is possible to automate the continuous transition of the dressing 'dressing conditions from rough to finish and to judge at what point the cutting and dressing should end.

FIG. 15 shows an embodiment of the present invention. 1. A method of automatically adjusting the magnitude of the contact discharge power consumption E · I p / 2 by numerical control or automatic control based on the estimated roundness of a stone. FIG.

In this embodiment, based on the average value and the peak value I _P of the output from the current detector A, provided contact discharge power E · I p Z 2 contact discharge power automatic adjusting apparatus 6 1 0 for automatically adjusting the Then, the precision of the contact discharge power consumption E · Ip / 2 is automatically adjusted by numerical control or automatic control based on the estimated value of the roundness of the whetstone to perform high-precision tool-dressing.

FIG. 16 is an explanatory view of a method of automatically terminating contact discharge tooling and dressing when an estimated value of roundness of a grindstone reaches a predetermined value according to an embodiment of the present invention. In this embodiment, when the estimated value of the roundness of the rolled stone reaches a predetermined value, an automatic end processing device 620 that automatically ends the processing of dressing and dressing is provided, and the trueness of the grinding stone is provided. Automatic truing and dressing when circularity reaches a satisfactory value So that it can be terminated.

FIG. 17 shows an embodiment of the present invention, in which the type of the supply voltage to the double-ring type rotating electrode is automatically switched between DC voltage and pulse voltage so that the control is more stably performed. FIG.

In this embodiment, an automatic switching device 630 for automatically switching the type of the supply voltage to the double ring type rotary electrode between the DC voltage and the pulse voltage is provided so that the control is performed more stably.

FIG. 18 is an explanatory view showing a method for performing contact discharge tooling 'dressing while measuring the tooling amount, showing an embodiment of the present invention.

In this embodiment, a displacement sensor 37 for measuring the position of the side surface of the electrode is provided on the side surface of the electrode, and the smoothing and dressing is performed while measuring the amount of smoothing. Further, as shown in FIG. 19, the displacement sensor 37 may be provided in the tooling device main body 71.

In this way, by installing a displacement sensor for measuring the position of the electrode side surface on the electrode side surface side, it becomes possible to monitor the amount of truing by contact discharge truing and dressing. When this is applied to in-process tooling and dressing, machining can be performed while correcting the tool path.

FIG. 20 is an explanatory view of a contact discharge tooling-ing 'dressing method which is applied to in-process tooling and dressing showing an embodiment of the present invention and is performed while correcting a tool path based on the amount of tooling. is there.

In this figure, reference numeral 8001 denotes a compensating device for compensating a thread pass based on the amount of tooling based on an output i from the sensor 37, and reference numeral 8002 denotes a numerically controlled movement for mounting a workpiece 803. It is a table.

In this embodiment, contact discharge truing and dressing are performed while correcting the tool path based on the amount of tooling by applying the present invention to twin process tuning and dressing.

When the dressing and dressing is performed by the above-described method, the electrode material adheres to the protruding portion (the portion where the runout is large) of the dressing and dressing grindstone, and as a result, the electrode continues to recede. May occur. So solve this problem In order to decide, it is effective to adopt the following configuration.

FIG. 21 is a view showing a tooling dressing apparatus having a double ring-shaped rotating electrode in which a conventional grindstone (non-conductive grindstone) is disposed inside showing an embodiment of the present invention. As shown in FIG. , Double ring type rotating electrode 910 composed of an inner electrode ring 9 13, an insulating layer 9.1 4, and an outer electrode electrode 9 15 rotated by the rotating main shaft 9 11 of the double ring type rotating electrode 9 10 A conventional grindstone (non-conductive grindstone) 9 12 is placed inside the box. With this configuration, even if the electrode material adheres to the protruding portion (the portion where the runout is large) of the tooling / dressing grindstone 100 by performing the tooling 'dressing, the double ring type is formed. The conventional grindstone (non-conductive grindstone) 912 placed inside the rotating electrode enables accurate removal.

As second 2 Figure shows in _c FIG illustrates a Tsuruingu-Doretsushingu device having a conventional grindstone double ring-shaped rotating electrode (non-conductive grindstone) arranged outside of an embodiment of the present invention, The double ring type rotating electrode 9 20 composed of the electrode inner ring 9 2 2, the insulating layer 9 2 3, and the electrode outer ring 9 2 4 rotated by the rotating main shaft 9 2 1 of the double ring type rotating electrode 9 2 0 A conventional grindstone (non-conductive grindstone) 9 25 is placed on the outside. With this configuration, even if the electrode material adheres to the protruding portion (the portion where the deflection is large) of the stone to be dressed and dressed by performing tooling and dressing, it is possible to perform double dressing. The conventional grindstone (non-conductive grindstone) 925 arranged outside the ring-shaped rotating electrode enables accurate removal.

It should be noted that the present invention is not limited to the above embodiments, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention. As described above, according to the present invention, the following effects can be obtained.

(A) The grinding and dressing of a super-granulated grinding wheel, particularly a super-abrasive grinding wheel having a metal binder, can be performed extremely easily.

(B) High-precision shape creation processing becomes possible.

(C) On-machine tooling 'dressing is possible even with a dry grinding machine.

(D) Regardless of conductive or non-conductive grinding wheels, tooling and dressing can be performed with the same device. (E) The grinding wheel work surface with high roundness can be obtained.

(F) It is economical because the electrode consumption is small, and the working environment can be kept clean.

(G) A sharp V-shaped cutting edge can be easily formed.

(H) The roundness of the grinding wheel can be monitored while performing dressing and dressing. As a result, it is possible to provide appropriate cutting and dressing conditions suitable for each occasion.

(I) In in-process tooling 'dressing, machining can be performed while correcting the tool path.

(J) Even if the electrode material adheres to the protruding part (the part with large runout) of the to-be-dressed / dressing grindstone by performing the dressing / dressing, the inside or outside of the double ring type rotating electrode The conventional grindstone (non-conductive grindstone) placed on the surface enables accurate removal. Industrial applicability

INDUSTRIAL APPLICABILITY The contact discharge tooling-dressing method and apparatus of the present invention can perform truing and dressing of a superabrasive grindstone, particularly a superabrasive grindstone having a metal binder, in an extremely simple manner, It is suitable as a contact discharge device capable of forming a shape.

Claims

The scope of the claims

1. Bring the rotating conductive tooling and dressing wheel into contact with a pair of electrodes to which a DC voltage or pulse voltage is applied, and contact the positive electrode, electrode chips, grinding wheel binder, and electrode chips. A contact discharge tooling / dressing method in which the conductive tool-dressing-dressing grindstone is intermittently dressed by dressing caused by opening and closing a circuit composed of electrodes. A contact discharge truing and dressing method, wherein a part of the side surface of a double ring-shaped rotary electrode insulated by a body is used as a pair of electrodes.

2. A pair of electrodes to which a DC voltage or pulse voltage is applied, a rotating non-conductive tool to be rotated. A circuit consisting of a chip of one positive electrode and one negative electrode by contacting dressing rubble. A contact discharge method in which the non-conductive threading 'dressing grindstone is intermittently dressed by dressing due to contact discharge generated at the time of opening and closing. A contact discharge tooling and dressing method, characterized in that a part of the side surface of a double ring-shaped rotary electrode insulated with an insulator of 100 am or less is used as a pair of electrodes.

3. The rotating conductive tooling 'dressing wheel is brought into contact with a pair of electrodes to which a DC voltage or pulse voltage is applied, and the positive electrode-electrode chip-grinding wheel binder-electrode chip-negative Due to the contact discharge generated when opening and closing the circuit composed of the electrodes, the conductive grinding object '

• Dressing contact discharge tooling and dressing equipment,

(a) a double ring-shaped rotating electrode insulated by an insulator;

(b) A contact discharge tooling and dressing device comprising: a pair of electrodes formed by a part of a side surface of the double ring-shaped rotary electrode.

4. A rotating non-conductive tooling 'dressing wheel is brought into contact with a pair of electrodes to which a DC voltage or pulse voltage is applied to open and close a circuit consisting of chips from one positive electrode and one negative electrode. A contact discharge generated when the non-conductive threading / dressing stone is intermittently threaded / dressed due to contact discharge generated at the time of the contacting. (a) a double ring-shaped rotating electrode insulated with an insulator having a thickness of several hundreds of meters or less;

(b) A contact discharge truing dressing device comprising: a pair of electrodes formed by a part of a side surface of the double ring-shaped rotary electrode.

5. The contact discharge tooling and dressing device according to claim 3 or 4, further comprising a drive mechanism for driving the double ring-shaped rotary electrode in a rotation axis direction. apparatus.

6. The contact discharge tooling 'dressing device according to claim 3, 4 or 5, characterized in that the contact discharge device has a structure capable of supplying power to a double ring-shaped rotating electrode having a different diameter. Tooling 'dressing equipment.

7. The contact discharge tooling-dressing method according to claim 1 or 2, wherein the contact discharge is performed in a liquid, spray, or air environment. .

8. The contact discharge tooling and dressing method according to claim 1 or 2, wherein in order to remove an initial rotational runout of a side surface of the double ring-shaped rotary electrode, the threaded portion is supplied without supplying power between the electrodes. · A contact discharge tooling and dressing method characterized in that after grinding the side surface of the electrode with a dressing whetstone, a voltage is applied between the electrodes to start tooling and dressing.

9. The apparatus according to claim 3, 4, or 5, wherein a predetermined angle is provided between the rotation axis of the electrode and the rotation axis of the tooling 'dressing grindstone, and the electrode rotation axis is applied to the electrode. A contact discharge tooling and dressing method characterized in that a predetermined grinding wheel tip shape is obtained by giving a feed in a direction.

10. The device according to claim 3, 4 or 5, wherein the driving device for the double ring-shaped rotary electrode is installed on a numerically controlled moving table provided with a cross moving mechanism and a rotating mechanism, so that a high-precision total is provided. Contact discharge tool ink characterized by performing mold tooling and dressing. ■ Dressing method.

11. The contact discharge current limiting resistor and the current detector are inserted into the power supply circuit side of the device so as to be in series with the electrode pair, using the device according to claim 3, 4, or 5. Numerical control of the feed rate of the double ring-shaped rotary electrode in the direction of the rotation axis is performed so that the power consumption between the electrodes is maximized when the peak value Ip is reached. A contact discharge tooling and dressing method.

12. The contact discharge tooling and dressing method according to claim 11, wherein the flat value I _M and the peak value I _P of the output from the current detector are set to be equal to or more than one rotation of the dressing grindstone. Contact discharge based on the value of ツ / I p, and performing the ル leating 'dressing while estimating the roundness of the dressing whetstone. Tooling and dressing method.

13. The contact discharge tooling and dressing method according to claim 12, wherein the contact discharge power consumption E · IP 2 by numerical control or automatic control based on the estimated roundness of the truing / dressing grindstone. A contact discharge tooling and dressing method, which comprises automatically adjusting the size of the tool and performing high precision tooling and dressing.

14. The contact-discharge tooling and dressing method according to claim 12, wherein the rounding and dressing is performed when the estimated roundness of the to-be-dressed / dressing grindstone becomes less than a predetermined size. A contact discharge tooling and dressing method characterized by automatically terminating.

15. The contact discharge tooling and dressing method according to claim 11, wherein the type of the supply voltage to the double ring-shaped rotary electrode is set to the DC voltage and the pulse voltage so that the control is performed more stably. A contact discharge tooling and dressing method, wherein the method automatically switches between the modes.

16. The contact discharge tooling 'dressing device according to claim 3, 4 or 5, further comprising a displacement sensor for measuring a position of the electrode side surface on the side surface of the electrode, and measuring a threading amount. A contact discharge tooling and dressing method that specializes in tooling and dressing.

17. The contact discharge tooling 'dressing device according to claim 3, 4 or 5, further comprising a displacement sensor for measuring a position of the electrode side surface on the side surface of the electrode. Inging and dressing equipment.

18. The contact discharge, characterized in that the contact discharge threading 'dressing method according to claim 16 is applied to in-process truing and dressing while performing a tool path correction based on the amount of threading. Tooling · Dressing Law.

19. The contact discharge tooling 'dressing method according to claim 1 or 2, wherein a grindstone is arranged inside the double ring-shaped rotating electrode, and the discharge is applied to the tooling' dressing grindstone at every discharge. A contact discharge truing 'dressing method characterized by removing deposits on an electrode material.

20. In the contact discharge tooling 'dressing method according to claim 1 or 2, a grindstone is arranged outside the double ring-shaped rotary electrode, and the discharge to the tooling' dressing grindstone is performed every discharge. A contact discharge tooling and dressing method characterized by removing deposits on an electrode material.

21. The contact discharge tooling and dressing device according to claim 3 or 4, wherein a grindstone is arranged inside the double ring-shaped rotary electrode.

22. The contact discharge tooling / dressing apparatus according to claim 3 or 4, wherein a grindstone is arranged outside the double ring-shaped rotary electrode.